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authorAkinobu Mita <akinobu.mita@gmail.com>2018-06-26 00:22:42 +0900
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2018-06-30 18:27:27 +0100
commit732238e22e4c5497bd76d02adcf5c4fcba6dcb67 (patch)
treed616cd736458012782adeb6b35f56c30e1344aa2 /drivers/iio/accel
parent9048f1f18a70a01eaa3c8e7166fdb2538929d780 (diff)
downloadlinux-732238e22e4c5497bd76d02adcf5c4fcba6dcb67.tar.bz2
iio: accel: adxl345: add calibration offset support
The ADXL345 provides the offset adjustment registers for each axis. This adds the iio channel information for the calibraion offsets with that feature. Cc: Eva Rachel Retuya <eraretuya@gmail.com> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/accel')
-rw-r--r--drivers/iio/accel/adxl345_core.c41
1 files changed, 40 insertions, 1 deletions
diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c
index 7a25840d806f..7b29ae8375e9 100644
--- a/drivers/iio/accel/adxl345_core.c
+++ b/drivers/iio/accel/adxl345_core.c
@@ -18,6 +18,10 @@
#include "adxl345.h"
#define ADXL345_REG_DEVID 0x00
+#define ADXL345_REG_OFSX 0x1e
+#define ADXL345_REG_OFSY 0x1f
+#define ADXL345_REG_OFSZ 0x20
+#define ADXL345_REG_OFS_AXIS(index) (ADXL345_REG_OFSX + (index))
#define ADXL345_REG_POWER_CTL 0x2D
#define ADXL345_REG_DATA_FORMAT 0x31
#define ADXL345_REG_DATAX0 0x32
@@ -56,7 +60,8 @@ struct adxl345_data {
.modified = 1, \
.channel2 = IIO_MOD_##axis, \
.address = index, \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_CALIBBIAS), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
}
@@ -72,6 +77,7 @@ static int adxl345_read_raw(struct iio_dev *indio_dev,
{
struct adxl345_data *data = iio_priv(indio_dev);
__le16 accel;
+ unsigned int regval;
int ret;
switch (mask) {
@@ -94,6 +100,38 @@ static int adxl345_read_raw(struct iio_dev *indio_dev,
*val2 = adxl345_uscale;
return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CHAN_INFO_CALIBBIAS:
+ ret = regmap_read(data->regmap,
+ ADXL345_REG_OFS_AXIS(chan->address), &regval);
+ if (ret < 0)
+ return ret;
+ /*
+ * 8-bit resolution at +/- 2g, that is 4x accel data scale
+ * factor
+ */
+ *val = sign_extend32(regval, 7) * 4;
+
+ return IIO_VAL_INT;
+ }
+
+ return -EINVAL;
+}
+
+static int adxl345_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct adxl345_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_CALIBBIAS:
+ /*
+ * 8-bit resolution at +/- 2g, that is 4x accel data scale
+ * factor
+ */
+ return regmap_write(data->regmap,
+ ADXL345_REG_OFS_AXIS(chan->address),
+ val / 4);
}
return -EINVAL;
@@ -101,6 +139,7 @@ static int adxl345_read_raw(struct iio_dev *indio_dev,
static const struct iio_info adxl345_info = {
.read_raw = adxl345_read_raw,
+ .write_raw = adxl345_write_raw,
};
int adxl345_core_probe(struct device *dev, struct regmap *regmap,